Classes, traits, and interfaces - 9.5.x - drupal
Introduction to classes
A lot of the PHP code in Drupal is object oriented (OO), making use of PHP classes, interfaces, and traits. See the Objected-oriented programming conventions for more information.
See also
Objected-oriented programming conventions
File
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              core/
core.api.php, line 1523  
| Name | Deprecated | Object type | Namespace | File name | Summary | Direct uses | Use statements | Strings | 
|---|---|---|---|---|---|---|---|---|
| BackendCompilerPassTest | class | Drupal\Tests\Core\DependencyInjection\Compiler | core/ | 
                                                                                        @coversDefaultClass \Drupal\Core\DependencyInjection\Compiler\BackendCompilerPass[[api-linebreak]] @group DependencyInjection | ||||
| BackwardCompatibilityTest | class | Drupal\FunctionalJavascriptTests\Ajax | core/ | 
                                                                                        Tests the compatibility of the ajax.es6.js file. | ||||
| BadPluginDefinitionException | class | Drupal\migrate\Plugin\Exception | core/ | 
                                                                                        Defines a class for bad plugin definition exceptions. | 4 | |||
| BaloneySpam | class | Drupal\block_test\Plugin\Condition | core/ | 
                                                                                        Provides a 'baloney_spam' condition. | ||||
| BanAdmin | class | Drupal\ban\Form | core/ | 
                                                                                        Displays banned IP addresses. | 1 | |||
| Banana | class | Drupal\plugin_test\Plugin\plugin_test\fruit | core/ | 
                                                                                        Plugin annotation @Plugin( id = "banana", label = "Banana", color = "yellow", uses = { "bread" = @Translation("Banana bread"), "loaf" = @PluralTranslation( singular = "@count loaf", plural = "@count loaves" ) } ) | ||||
| BanDelete | class | Drupal\ban\Form | core/ | 
                                                                                        Provides a form to unban IP addresses. | 1 | |||
| BanIpManager | class | Drupal\ban | core/ | 
                                                                                        Ban IP manager. | 1 | 2 | ||
| BanIpManagerInterface | interface | Drupal\ban | core/ | 
                                                                                        Provides an interface defining a BanIp manager. | 1 | 3 | ||
| BanMiddleware | class | Drupal\ban | core/ | 
                                                                                        Provides a HTTP middleware to implement IP based banning. | 1 | 2 | ||
| BanMiddlewareTest | class | Drupal\Tests\ban\Unit | core/ | 
                                                                                        @coversDefaultClass \Drupal\ban\BanMiddleware[[api-linebreak]] @group ban | ||||
| Bar | class | Drupal\image_test\Plugin\ImageToolkit\Operation\test | core/ | 
                                                                                        Builds an image toolkit operation. | ||||
| BarClass | class | Drupal\Tests\Core\DependencyInjection\Fixture | core/ | 
                                                                                        Stub class which acts as a service to test the container. | 2 | |||
| BareHtmlPageRenderer | class | Drupal\Core\Render | core/ | 
                                                                                        Default bare HTML page renderer. | 2 | |||
| BareHtmlPageRenderer | class | Drupal\Core\ProxyClass\Render | core/ | 
                                                                                        Provides a proxy class for \Drupal\Core\Render\BareHtmlPageRenderer. | ||||
| BareHtmlPageRendererInterface | interface | Drupal\Core\Render | core/ | 
                                                                                        Bare HTML page renderer. | 2 | 4 | ||
| BartikTest | class | Drupal\Tests\bartik\Functional | core/ | 
                                                                                        Tests the Bartik theme. | ||||
| BaseCommand | class | Drupal\Core\Ajax | core/ | 
                                                                                        Base command that only exists to simplify AJAX commands. | 6 | 6 | ||
| BaseFieldAccessTest | class | Drupal\Tests\views\Functional\Entity | core/ | 
                                                                                        Tests views base field access. | ||||
| BaseFieldDefinition | class | Drupal\Core\Field | core/ | 
                                                                                        A class for defining entity fields. | 2 | 99 | ||
| BaseFieldDefinitionTest | class | Drupal\Tests\Core\Entity | core/ | 
                                                                                        Unit test for BaseFieldDefinition. | ||||
| BaseFieldDefinitionTest | class | Drupal\Tests\migrate\Unit\Plugin\migrate\destination | core/ | 
                                                                                        Stub class for BaseFieldDefinition. | ||||
| BaseFieldDefinitionTestBase | abstract class | Drupal\Tests\Core\Field | core/ | 
                                                                                        Provides setup method for testing base field definitions. | 1 | 1 | ||
| BaseFieldFileFormatterBase | abstract class | Drupal\file\Plugin\Field\FieldFormatter | core/ | 
                                                                                        Base class for file formatters, which allow to link to the file download URL. | 4 | |||
| BaseFieldOverride | class | Drupal\Core\Field\Entity | core/ | 
                                                                                        Defines the base field override entity. | 14 | |||
| BaseFieldOverrideAccessControlHandler | class | Drupal\Core\Field | core/ | 
                                                                                        Provides en entity access control handler for base field override entity. | ||||
| BaseFieldOverrideHalJsonAnonTest | class | Drupal\Tests\hal\Functional\Core | core/ | 
                                                                                        @group hal @group legacy | ||||
| BaseFieldOverrideHalJsonBasicAuthTest | class | Drupal\Tests\hal\Functional\Core | core/ | 
                                                                                        @group hal @group legacy | ||||
| BaseFieldOverrideHalJsonCookieTest | class | Drupal\Tests\hal\Functional\Core | core/ | 
                                                                                        @group hal @group legacy | ||||
| BaseFieldOverrideJsonAnonTest | class | Drupal\FunctionalTests\Rest | core/ | 
                                                                                        @group rest | ||||
| BaseFieldOverrideJsonBasicAuthTest | class | Drupal\FunctionalTests\Rest | core/ | 
                                                                                        @group rest | ||||
| BaseFieldOverrideJsonCookieTest | class | Drupal\FunctionalTests\Rest | core/ | 
                                                                                        @group rest | ||||
| BaseFieldOverrideResourceTestBase | abstract class | Drupal\FunctionalTests\Rest | core/ | 
                                                                                        9 | 3 | |||
| BaseFieldOverrideStorage | class | Drupal\Core\Field | core/ | 
                                                                                        Storage class for base field overrides. | ||||
| BaseFieldOverrideTest | class | Drupal\KernelTests\Core\Field\Entity | core/ | 
                                                                                        @coversDefaultClass \Drupal\Core\Field\Entity\BaseFieldOverride[[api-linebreak]] @group Field | ||||
| BaseFieldOverrideTest | class | Drupal\Tests\jsonapi\Functional | core/ | 
                                                                                        JSON:API integration test for the "BaseFieldOverride" config entity type. | ||||
| BaseFieldOverrideXmlAnonTest | class | Drupal\FunctionalTests\Rest | core/ | 
                                                                                        @group rest | ||||
| BaseFieldOverrideXmlBasicAuthTest | class | Drupal\FunctionalTests\Rest | core/ | 
                                                                                        @group rest | ||||
| BaseFieldOverrideXmlCookieTest | class | Drupal\FunctionalTests\Rest | core/ | 
                                                                                        @group rest | ||||
| BaseFormIdInterface | interface | Drupal\Core\Form | core/ | 
                                                                                        Provides an interface for a Form that has a base form ID. | 5 | 5 | ||
| BaseThemeMissingTest | class | Drupal\KernelTests\Core\Theme | core/ | 
                                                                                        Tests the behavior of a theme when base_theme info key is missing. | ||||
| BaseThemeRequiredTest | class | Drupal\KernelTests\Core\Theme | core/ | 
                                                                                        Tests the behavior of the `base theme` key. | ||||
| Basic | class | Drupal\views\Plugin\views\exposed_form | core/ | 
                                                                                        Exposed form plugin that provides a basic exposed form. | ||||
| BasicAuth | class | Drupal\basic_auth\Authentication\Provider | core/ | 
                                                                                        HTTP Basic authentication provider. | 2 | |||
| BasicAuthResourceTestTrait | trait | Drupal\Tests\rest\Functional | core/ | 
                                                                                        Trait for ResourceTestBase subclasses testing $auth=basic_auth. | 154 | |||
| BasicAuthTest | class | Drupal\Tests\basic_auth\Functional | core/ | 
                                                                                        Tests for BasicAuth authentication provider. | ||||
| BasicAuthTestController | class | Drupal\basic_auth_test | core/ | 
                                                                                        |||||
| BasicAuthTestTrait | trait | Drupal\Tests\basic_auth\Traits | core/ | 
                                                                                        Provides common functionality for Basic Authentication test classes. | 2 | |||
| BasicControllerClass | class | Drupal\Tests\Core\Entity | core/ | 
                                                                                        A class containing all kind of different controller methods. | ||||
| BasicForm | class | Drupal\Tests\Core\Entity | core/ | 
                                                                                        A basic form with a passed entity with an interface. | 
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